The slow gear train is dirty/greasy.
I have a Copal #0 originally from a Polaroid 110A Land Camera 127mm f/4.7. Speeds 1/15-1/300 seem good but 1-1/8 just cause the shutter to stick open. I don't really see grease on the blades. Bulb mode works fine. Cable release and standard release both have the same behavior.
Anyone know what causes this abrupt cutoff of the slow speeds?
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Cleaning rather than lubrication is the answer. You should not be applying oil anywhere. These shutters run dry. Did you read the manual someone else linked to?I was able to lube it and get it fully working with a few hours effort! It wasn't very dirty inside, but it was dry as a bone.
Cleaning rather than lubrication is the answer. You should not be applying oil anywhere. These shutters run dry. Did you read the manual someone else linked to?
I wonder if decades of oxidation and such make lubrication almost necessary? I can understand clean, freshly polished surfaces working well. And binding from the surface tension of oil or grease might be a failure point. But maybe time and corrosion introduce drag that is best overcome with oil, less drag than the corrosion?Cleaning rather than lubrication is the answer. You should not be applying oil anywhere. These shutters run dry. Did you read the manual someone else linked to?
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The level of disassembly required to adequately clean every part of this thoroughly is not in my abilities.
I wonder if decades of oxidation and such make lubrication almost necessary? I can understand clean, freshly polished surfaces working well. And binding from the surface tension of oil or grease might be a failure point. But maybe time and corrosion introduce drag that is best overcome with oil, less drag than the corrosion?
Just thinking out loud here.
Not really. Dunk the whole shutter in an ultrasonic cleaner filled with IPA (note precautions using IPA in an ultrasonic cleaner).
If there are any painted surfaces on the shutter in question, this practice will strip any and all paint off the components. If there are any plastic components in that shutter, this will potentially ruin those as well. This is absolutely NOT correct technique.
Well, it's something I've done many times with no negative effects. Maybe you shouldn't comment unless you've actual personal experience. Maybe you're one of these people who like to make out the only way of doing something is your way and can't accept that someone else may have a better way of doing it. Get over it.
Yes, but alcohol + ultrasonic cleaner — that's a very different circumstance. Monopix specifically stated: "Dunk the whole shutter in an ultrasonic cleaner filled with IPA". But hey, go ahead and try it. Nothing like FAFO.Yeah, it's going to depend on the type of paint: I've tested alcohol with painted surfaces in my house. Some it's fine with, others start peeling up immediately. You'll find the same with cameras, and you probably won't know until it's too late.
I have a feeling that @retina_restoration has a fair amount of experience wrt various repair options, given his experience repairing Retina cameras.
For that reason, I would pay attention to any warnings he passes on, even if there are examples of shutters and lenses and cameras that would not be deleteriously affected by a dunk in alcohol.
Appreciate that.
All I need to point out is that Monopix suggested using alcohol with an ultrasonic cleaner, which is a very different thing than simply cleaning something with alcohol.
In old shutters, sometimes, a very small amout of oil in appropriate places can help. But we're talking almost invisible amounts and only in certain places like spindle bearings of escapements.
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